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Lease Commitments - Schedule of Future Minimum Lease Payments under Non-Cancelable Leases (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($)
Leases [Abstract] |
Minimum lease payments, sublease rentals under non-cancelable subleases | $ 700,000

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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Balance Type: | credit
Period Type: | duration